It's too simple. Why do you ask? ImpactFactor refers to the average citation rate of journals in recent two years, that is, the average citation times of papers published in the first two years of the evaluation year, which directly represents the influence and level of journals. The greater the impact factor, the greater the influence of the journal, and the higher the quality and level of the journal. Journals with high impact factors are often core journals with high paper quality or journals with strong international characteristics.

However, it is difficult to compare and evaluate SCI journals between different disciplines.

In order to scientifically evaluate academic journals and reasonably assess the work performance of researchers, the Literature Information Center of China Academy of Sciences divides the journals published by JCR into 13 categories, and each category of journals is divided into four regions according to their impact factors and cited frequency, and the journals are ranked from high to low, among which the first regional journals and a few second regional journals are defined as top-level journals. SCI papers published in 1 zone and zone 2 are generally considered as important achievements in this field.

The impact factors of some periodicals in 1 area or 2 area are also very low. For example, Journal of Virology (IF=5.402) is the best (if = 5.402), but it is no less difficult to publish a journal on it than Nature (IF=36.28).

If you want to see the specific classification of periodicals, MedSci contains the latest Sci periodical partition table, which can be viewed.